Pros:
Item Effect are good for Master Yi Ult and other skills.
Wriggler's Lantern give you a ward. (2 ward for you now because of trinket and lantern).
Good for chasing!
Good for 1 v 1 (most of the time).
Quick Escaping (Just ward over the wall in the jungle and alpha strike to the monster).

Cons:
Not really good in team fight.

Make sure you activate Ghostblade with your ult when going in for kills.
Use your ward!

Haven't applied your max ult to 132 percent attack speed yet? After applying it you get 104 percent MORE! (max is 250 percent)